It's much different if we compare the performance of Nunes and Erling Haaland, Nunes' playing style is still below Erling Haaland,
You can't compare between Nunez and Haaland since both of them have very different play style. Haaland is very aggressive even a good defenders can't steal the ball from him, tackling is the best way though it's risky.
while Nunes had not scored a single goal for Liverpool in the Premier League, according to predictions of the possibility that Erling Halland would become the Premier League's top scorer for the 2022-2023 season.
Are you not watches Liverpool vs Fulham on the first week? it's clearly Nunez score one goal on the second half, how you can say he had not scored any goal?
For that Man City signed Haaland for a fairly high transfer value but it's worth it because the contribution Haaland has made to Man City so far has certainly lived up to Guardiola's expectations.
It's depends from how you look it. $60 Million is really a huge money for most people. But if you compare how much they spend to get Haaland for $60 Million and currently become the best striker, it's really cheap considering Manchester United spend $80 Million to sign Maguire with very bad performance.